I pulled apart the 283 V8 from my Dad's old Chevy truck today. And the motor was fairly waxed up inside but not to bad for a 40 year old motor that has never been apart. It only has 168,000 miles on it, and has done a lot of sitting over the years. The bearings are pitted from the sitting and neglect the past 10 years without the oil being changed. I has only had QS HD 30 and 10W30 super blend. The reason it had to come apart is because it had a sunk exhaust valve in each head. The block and crank measure out to be standard. Quaker State must be good stuff after all.